In which publication did Galileo first announce his findings about the Moon's topography in 1610?

Answer

Sidereus Nuncius

Galileo compiled his revolutionary astronomical findings, including the Moon's topography, in the short Latin treatise published in 1610 called Sidereus Nuncius (The Starry Messenger).

In which publication did Galileo first announce his findings about the Moon's topography in 1610?
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